Select Tcp Server

   

/*
C# Network Programming 
by Richard Blum

Publisher: Sybex 
ISBN: 0782141765
*/
using System;
using System.Collections;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class SelectTcpSrvr
{
   public static void Main()
   {
      ArrayList sockList = new ArrayList(2);
      ArrayList copyList = new ArrayList(2);
      Socket main = new Socket(AddressFamily.InterNetwork,
                         SocketType.Stream, ProtocolType.Tcp);

      IPEndPoint iep = new IPEndPoint(IPAddress.Any, 9050);
      byte[] data = new byte[1024];
      string stringData;
      int recv;


      main.Bind(iep);
      main.Listen(2);

      Console.WriteLine("Waiting for 2 clients...");
      Socket client1 = main.Accept();
      IPEndPoint iep1 = (IPEndPoint)client1.RemoteEndPoint;
      client1.Send(Encoding.ASCII.GetBytes("Welcome to the server"));
      Console.WriteLine("Connected to {0}", iep1.ToString());
      sockList.Add(client1);

      Console.WriteLine("Waiting for 1 more client...");
      Socket client2 = main.Accept();
      IPEndPoint iep2 = (IPEndPoint)client2.RemoteEndPoint;
      Console.WriteLine("Connected to {0}", iep2.ToString());    
      client2.Send(Encoding.ASCII.GetBytes("Welcome to the server"));
      sockList.Add(client2);
      main.Close();

      while(true)
      {
         copyList = new ArrayList(sockList);
         Console.WriteLine("Monitoring {0} sockets...", copyList.Count);
         Socket.Select(copyList, null, null, 10000000);

         foreach(Socket client in copyList)
         {
            
            data = new byte[1024];
            recv = client.Receive(data);
            stringData = Encoding.ASCII.GetString(data, 0, recv);
            Console.WriteLine("Received: {0}", stringData);
            if (recv == 0)
            {
               iep = (IPEndPoint)client.RemoteEndPoint;
               Console.WriteLine("Client {0} disconnected.", iep.ToString());
               client.Close();
               sockList.Remove(client);
               if (sockList.Count == 0)
               {
                  Console.WriteLine("Last client disconnected, bye");
                  return;
               }
            }
            else
               client.Send(data, recv, SocketFlags.None);
         }
      }
   }
}